01 Introduction
Sylvain Tissier — fullstack developer, founder & consultant based in Paris, France. I design and ship SaaS products and AI-era tools, and help teams automate what actually pays off. Previously a Web3/blockchain consultant — that era now lives in the archive.
Available for freelance projects
02 Current ventures
Products and services I own and run — from AI developer tooling to anti-hype automation consulting.
The workspace built for AI-driven development. Run Claude, Codex, Gemini and other CLI agents in parallel across projects — each with isolated ports, browser identities, terminals and git worktrees. Desktop app for macOS, Windows and Linux.
Electron · React · Convex
polystro.comAnti-hype automation ROI consulting for operations teams. Most agencies sell hype — we sell math. Measure ROI first, start small, and scale only what proves 3x+ returns.
Astro · Cloudflare
nodiumlabs.comA CRM intelligence layer that tells sales teams which deals can really sign: deterministic Deal Confidence Score, pipeline confidence map, and fragile-deal detection.
TanStack Start · Convex · Cloudflare
foxcloselabs.comA system of record for knowledge. Capture, structure and retrieve information you can trust months later — with immutable history, full export, and no lock-in.
Next.js · AdonisJS · PostgreSQL
notarium.appA SaaS for French condominium property managers (syndics de copropriété): per-building accounting, appels de fonds, general assemblies, supplier invoices with AI extraction, and owner portals.
TanStack Start · Fastify · PostgreSQL
sancterius.com — coming soonA production-ready, self-hostable SaaS foundation: auth (MFA, OAuth, SSO, RBAC), multi-tenant teams, billing (Stripe, Paddle, Polar), admin back-office, and a plugin marketplace.
Next.js · AdonisJS · PostgreSQL · Stripe
saas-backbone.com — coming soon03 The book
Practical workflows to stay relevant at work — by Sylvain Tissier
French edition: « Adoptez l'IA maintenant ou restez derrière »Most AI advice is hype or prompt lists. This book teaches workflows — how to turn AI into leverage without sacrificing quality: pick the right execution model per task, install trust gates so “fluent wrong” never ships, build reusable assets that compound, and prove value with evidence.
AI doesn't replace standards. It multiplies them.
04 Writing & contributions
Long-form posts on Medium, plus contributions to a book that taught a lot of people Ethereum.
Contributor to “Mastering Ethereum” (Andreas Antonopoulos) — privacy-enhancing patterns, upgradability patterns, and gas refunds.
05 Archive
LinkedTeam — social website for teams· Fox Close — the first solution dedicated to the closing of sales (original version)· BitFunding — open-source crowdfunding platform using Bitcoin· MoneyUnion — landing page for a Bitcoin remittance company· Ethereum ↔ Hyperledger bridge — proof of concept
06 Kind words
From recent freelance engagements.
He is really nice. He knows what we want, gave us useful suggestions. Good communication, and it looks great! Thanks for the work.
Une implication et une organisation projet bien structurée et conforme aux engagements… Prestation d'une grande qualité d'ensemble et respect des engagements.
07 Contact
I'm available for freelance projects — product builds, AI-era tooling, or automation that has to pay for itself. Let's talk.
Get in touch on LinkedIn